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Cortisol suppression test in patients with elevated adrenocorticotropic hormone levels
Annals of Internal Medicine
|March 1, 1982
Summary
High adrenocorticotropic hormone (ACTH) after adrenalectomy may indicate a pituitary tumor. A cortisol suppression test helps differentiate this from other causes by measuring ACTH levels before and after cortisol infusion.
Area of Science:
- Endocrinology
- Pituitary Gland Disorders
- Adrenal Gland Disorders
Background:
- Elevated adrenocorticotropic hormone (ACTH) post-bilateral adrenalectomy can stem from pituitary tumors, inadequate cortisol replacement, or hypothalamic-pituitary-adrenal feedback loop dysfunction.
- Distinguishing the cause of elevated ACTH is crucial for appropriate patient management.
Purpose of the Study:
- To evaluate the utility of a cortisol suppression test in differentiating pituitary tumors as a cause of increased ACTH levels following bilateral adrenalectomy.
Main Methods:
- ACTH levels were measured in five groups: normal volunteers, patients with idiopathic adrenal insufficiency, and patients with bilateral adrenalectomy (with and without confirmed or suspected pituitary tumors).
- Measurements were taken before and after a 4-hour infusion of cortisol (20 mg/h).
Main Results:
- Baseline ACTH levels were higher in all patient groups compared to normal volunteers, with some overlap.
- Cortisol infusion suppressed ACTH in all subjects.
- The reduction in ACTH levels was significantly less pronounced in patients with confirmed or suspected pituitary tumors compared to normal volunteers and those with adrenal insufficiency.
Conclusions:
- The cortisol suppression test is a valuable tool for determining if elevated ACTH levels after bilateral adrenalectomy are attributable to a pituitary tumor.
- This test aids in distinguishing pituitary-related ACTH elevation from other causes in post-adrenalectomy patients.
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